Leaf cell bio 10

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Across
  1. 2. (or cleft) the margins between the irregular teeth go more than halfway to the midrib.
  2. 3. the blade of a leaf.
  3. 4. (also called the axis) the main support of the plant.
  4. 6. the waxy, water-repelling layer on the outer surface of a leaf that helps keep it from dying out (and protect it from invading bacteria, insects, and fungi). The cuticle is secreted by the epidermis (including the guard cells) and is often thinner on the underside of leaves. The cuticle is generally thicker on plants that live in dry environments.
  5. 8. having a smooth edge with neither teeth nor lobes.
  6. 11. mesophyll a layer of elongated cells located under the upper epidermis. These cells contain most of the leaf's chlorophyll, converting sunlight into usable chemical energy for the plant.
  7. 15. (or toothed) - having small, pointy teeth that point toward the tip of the leaf.
  8. 16. the process in which plants convert sunlight, water, and carbon dioxide into food energy (sugars and starches), oxygen and water. Chlorophyll or closely-related pigments (substances that color the plant) are essential to the photosynthetic process.
  9. 17. the chlorophyll-containing leaf tissue located between the upper and lower epidermis. These cells convert sunlight into usable chemical energy for the plant.
  10. 20. cell - one of a pair of sausage-shaped cells that surround a stoma (a pore in a leaf). Guard cells change shape (as light and humidity change), causing the stoma to open and close.
  11. 22. the angle between the upper side of the stem and a leaf or petiole.
Down
  1. 1. (vascular bundle) - Veins provide support for the leaf and transport both water and minerals (via xylem) and food energy (via phloem) through the leaf and on to the rest of the plant.
  2. 2. a compound leaf that is made up of many small leaflets arranged in pairs on either side of a long central midrib (the rachis). There is often a single terminal leaflet at the end of the midrib.
  3. 4. mesophyll - the layer below the palisade mesophyll; it has irregularly-shaped cells with many air spaces between the cells. These cells contain some chlorophyll. The spongy mesophyll cells communicate with the guard cells (stomata), causing them to open or close, depending on the concentration of gases.
  4. 5. the central rib of a leaf - it is usually continuous with the petiole.
  5. 6. having rounded teeth.
  6. 7. space intercellular gaps within the spongy mesophyll. These gaps are filled with gas that the plant uses (carbon dioxide - CO2 ) and gases that the plant is expelling (oxygen - O2, and water vapor).
  7. 9. the protective, outler layer of cells on the surface of a leaf. The guard cells (and stoma) are part of the epidermis. The surface of many leaves is coated with a waxy cuticle which is secreted by the epidermis.
  8. 10. divided into rounded or pointed sections and the incisions (cuts) go less than halfway to the midrib.
  9. 12. a molecule in leaves that can use light energy from sunlight to turn water and carbon dioxide gas into sugar and oxygen (this process is called photosynthesis). Chlorophyll is magnesium-based and is green.
  10. 13. leaf a leaf that is divided into many separate parts (leaflets) along a midrib (the rachis). All the leaflets of a compound leaf are oriented in the same plane.
  11. 14. (plural stomata) a pore (or opening) in a plant's leaves where water vapor and other gases leave and enter the plant. Stomata are formed by two guard cells that regulate the opening and closing of the pore. Generally, many more stomata are on the bottom of a leaf than on the top.
  12. 18. the small, paired appendages (sometimes leaf-life) that are found at the base of the petiole of leaves of many flowering plants.
  13. 19. a leaf stalk; it attaches the leaf to the plant.
  14. 21. apex the outer end of a leaf; the end that is opposite the petiole.